RE: [boost] boost.thread : Can one create a thread with an objectmember function?

From: Tim Laplaca (tlaplaca_at_[hidden])
Date: 2004-11-23 15:21:34

Thanks!  Since I don't need the class anymore I don't need to use bind,
but I'll keep this in mind for the future.

Thanks again,
Tim

-----Original Message-----
From: boost-bounces_at_[hidden]
[mailto:boost-bounces_at_[hidden]] On Behalf Of Cory Nelson
Sent: Monday, November 22, 2004 5:58 PM
To: boost_at_[hidden]
Subject: Re: [boost] boost.thread : Can one create a thread with an
objectmember function?

Yup!

boost::thread(boost::bind(&classname::method, boost::ref(thisptr)));

On Mon, 22 Nov 2004 10:50:17 -0500, Tim Laplaca <tlaplaca_at_[hidden]>
wrote:
> I am very new to boost, I apologize if this has been asked before.  I
> searched the mailing list archive but could not find an answer to my
> question.
> 
> I was successful creating threads with functions that are not members
of
> objects, but when I try to create threads with a pointer to an object
> member I get compilation errors (MS Visual Studio .NET).
> 
> Examples:
> 
> class objclass;
> 
> typedef void (objclass::*pmf)(); // ptr to member func
> 
> class objclass
> 
> {
> 
>      public:
> 
>            objclass() : thread_id (0) { p=&objclass::dowork; }
> 
>            inline setthreadid(int x) {thread_id = x;}
> 
>            inline setvaltwo(std::string str) {valtwo = str;}
> 
>            void dowork();
> 
>            pmf p; // pointer to dowork member function
> 
>            int getthreadid() {return thread_id;}
> 
>            std::string getvaltwo() {return valtwo;}
> 
>      private:
> 
>            int thread_id;
> 
>            std::string valtwo;
> 
> };
> 
> void objclass::dowork()
> 
> {
> 
> }
> 
> (In the main...)
> 
> boost::thread_group thrds;
> 
> objclass * objthread;
> 
> objthread = new objclass;
> 
> thrds.create_thread( (objthread->p) );
> 
> I get the following error:
> 
> c:\Boost\include\boost-1_31\boost\function\function_template.hpp(427):
> error C2664: 'void
>
boost::function0<R>::assign_to<Functor>(FunctionPtr,boost::detail::funct
> ion::function_ptr_tag)' : cannot convert parameter 2 from
> 'boost::detail::function::member_ptr_tag' to
> 'boost::detail::function::function_ptr_tag'
> 
>        with
> 
>        [
> 
>            R=void,
> 
>            Functor=pmf,
> 
>            FunctionPtr=pmf
> 
>        ]
> 
> Is there a way around this problem, or is it simply not possible to
make
> threads from object members with boost?
> 
> Thanks,
> 
> Tim
> 
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-- 
Cory Nelson
http://www.int64.org
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